Tube Converter - Yellow Jacket®, YJS

Tube Converter - Yellow Jacket®, YJS

Yellow Jacket
Tube Converter - Yellow Jacket®, YJS image 1
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Starting at: $44.95
Product Options
  • Quad (P-YJS-Q)
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The YJS is a specialized, current-limiting/voltage-conditioning adapter for use in most 20 to 100 watt amps that use 6L6, EL34, 6550 or 6V6 output tubes. The YJS is for amps with fixed bias power tubes. (Fixed bias tubes have their cathode connected directly to ground and a negative DC voltage applied to their control grid). All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.

  • All Yellow Jacket® converters come with JJ Brand EL84/6BQ5 vacuum tubes.
  • Converts most audio amplifiers with 6L6s, EL34s, 6550s, or 6V6s and similar-based tubes to EL84s without modification or rebiasing.
  • Converts: Class AB to Class A operation
  • Drops Output Power: 50% to 70%.
  • Safe for all common amplifiers and transformers.

Yellow Jacket® converters are a type of specialized adapter which permit the use of EL84/6BQ5 power tubes in place of 6V6, 6L6, EL34, and 7591 type vacuum tubes. Yellow Jacket® converters allow you to harness the musicality of EL84 vacuum tubes in amps that don't use them already - it's like getting a whole new amplifier!

There is no rebiasing involved, which makes modifying your amp's tone very easy. Yellow Jacket® converters give you simple Class-A operation from any amp. They not only rearrange the pin locations of the tubes, but also provide the necessary plate voltage drop and current limiting on the screens as well as blocking the amplifier's grid bias voltage while configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit. In other words, there are no adjustments to make and no modifications necessary, you simply plug the Yellow Jacket® into the amp's output tube sockets, (in cathode-bias amplifiers) screw the ground wires under one of the output tube socket mounting screws, plug the provided EL84s into the Yellow Jacket® converters, turn on the amp and play.

All Yellow Jacket® converters have a one year warranty against manufactured defects.

SKU:
P-YJS-X
Item ID:
001878
Brand:
Yellow Jacket
RoHS Compliant
Part Numbers
Quantity TypeOur Part NumberUPC/EAN
DuetP-YJS-D889406037199
QuadP-YJS-Q889406037236
SingleP-YJS609722126335
Product Measurements by Type
Item Diameter1.301 in.
Item Height, without pins2.18 in.
Item Height, with tube5.0 in.
Packaging Information
Packaging DimensionsDuet versionP-YJS-D3.4 in. × 2.4 in. × 2.4 in.
Quad versionP-YJS-Q4.75 in. × 3.75 in. × 2.531 in.
Single versionP-YJS3.4 in. × 2.4 in. × 2.4 in.
Weight (Packaging)Duet versionP-YJS-D0.347 lbs.
Quad versionP-YJS-Q0.541 lbs.
Single versionP-YJS0.225 lbs.
Product Measurements by Item
P-YJS-D - Duet versionItem Diameter1.301 in.
Item Height, without pins2.18 in.
Item Height, with tube5.0 in.
P-YJS-Q - Quad versionItem Diameter1.301 in.
Item Height, without pins2.18 in.
Item Height, with tube5.0 in.
P-YJS - Single versionItem Diameter1.301 in.
Item Height, without pins2.18 in.
Item Height, with tube5.0 in.

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Questions and Answers

Click each question to see its answers.
Asked by audiophile13 on January 3rd, 2016.
JustinG
January 7th, 2016
Staff Member
Top Contributor
Yes, the YJS is listed as being compatible with 6550 power tubes so you should be good to go.
Asked by audiophile13 on January 3rd, 2016.
JustinG
January 6th, 2016
Staff Member
Top Contributor
This is a solid product produced in house for maximum reliability. The socket should have an extremely long life though the tubes will have to be replaced periodically.
Asked by Anonymous on October 14th, 2016.
Matt H.
October 14th, 2016
Staff Member
A Fender Twin uses 6L6 tubes, giving it a very classic "American" sound. Converting your amp to EL84's using the Yellow Jackets converters will definitely get you closer to the "British" sound as AC30's utilized an EL84 power section.
Asked by Anonymous on October 14th, 2016.
Matt H.
October 14th, 2016
Staff Member
The YJS is compatible with 6550 tubes so you should be good to go but we always suggest measuring your space in the head to see if they converter and tube will fit. We are always more than happy to compare your measurements to the height of the Yellow Jacket.
Asked by Anonymous on October 14th, 2016.
Matt H.
October 14th, 2016
Staff Member
Your amp is a " fixed bias" with an adjustable bias pot. You should be able to take out the 6L6 tubes and install the Yellow Jackets with no issues or adjustment. When re installing the 6L6 tubes I would still suggest checking the bias but you can switch them at will.

Product Reviews

5.00 out of 5 based on 1 reviews
- December 8th, 2015
5 out of 5

Put them in my 1995 Bassman RI and wow - what a change! Taming the output; attenuating the bass; more grind at lower volumes; seems more articulate. Makes the amp a lot more useable in a lot more situations.
Highly recommended!